Rotary valve



G. H. KEMP ROTARY VALVE July 2,1935.

Filed Aug. 27, 1954 INVENTOR GaoRGe: HENRY KEMP ATTORNEY,

Patented July 2, 1935 PATENT QFHQE 1 425 ROTARY VALVE Ge r e Henry tems. at M ll n d t Wa es assignor of one -half t l iahr h amp ell Forrester, Cardiff, Wales pp ication ugus 7,

.3.4 Ser al N 74 6 18 n G eat B ita J n 2 19 3 2 Claims.

Thi inv tion re at s to otary a ve r u e am ng other ur oses to QntrQl th nial- 260f ex los ve gas s an the exh us of rn g ses o and from the cylinders of internal combustion engines, and has generally in view to provide a valve which is continuously rotatable in a single direction, which is of simple, compact, sturdy construction and possesses long life, and which is highly eflicient in operation. a

The valve includes a body or casing having a bore, separate intake and exhaust ports provid-v ing communication between an engine'cylinder and said bore, and exhaust ports leading from said bore. Within the bore is mounted a rotatable u plug which itself has a bore and a port leading laterally therefrom through the side of the plug for alinement with the intake port at predetermined times to admit explosive gas or other operating fluid to the cylinder, while in the side of said plug is a recess for alinement with the exhaust ports at predetermined times to permit the escape of exhaust products from the cylinder. In this connection a special object of the invention is to provide the body or casing with dual exhaust ports leading from the plug accommodating bore and to provide the plug with a side recess which serves to provide communication between the exhaust'port leading from the cylinderand first one of said dual exhaust ports, then both of said dual exhaust ports and, finally, the other of said dual exhaust ports, thereby to provide for an exceptionally free escape of exhaust products from the cylinder and, in a large measure, to eliminate the effects of back pressure in the cylinder.

With the foregoing and other objects in View, the invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter more fully described, illustrated in the accompanying drawing and defined in the appended claims.

In the drawing:-

Figure 1 is a central, longitudinal sectional view through a valve constructed in accordance with one practical embodiment of the invention; and

Figure 2 is a transverse section on the line 22 of Fig. 1.

Referring to the drawing in detail, 3 designates the valve body or casing having a longitudinally extending bore 3' in which is rotatably mounted the valve plug designated as 4, the plug being suitably journaled at its ends in the casing 3 and being equipped with a sprocket wheel l8 or other suitable means whereby it may be driven. Preferably the bore 3' and the plug 4 are tapered nd efera ly too the plu i i u aled at t ends in anti-friction bearings carried by thecasns 3. M r ov r i th plus is iape edis r m ans p efe a ly a e p ovide to ur e th Plus lon udinal hu to ma nta n t e same t h ly 5 seated within the bore 3, l lowever, these are featur hi h ma or a not he inc n lfa s in the valve as desired. Y Y

The bo y o c in 3 is in nded o b bo or otherwise secured in closing relationship to'tl e end of an engine cylinder designated as it and as ho n. or e ample in 1, an ro ai b or ca i a e rme w pos 8 and 9 W cha e sp c a r o i ud nall eith v lve anclwh p ov de co munic ti he wese the engine cylinder and the bore 3", the port 8 being provided for the escape of exhaust products from the cylinder and the port 9 being provided for the admission of explosive gases or other operating fluid to said cylinder.

Formed axially in the plug 6 and opening through one end thereof for connection with a source of operating fluid supply, such as a carburetor, is a bore 7 from which leads, through the side of the plug 4, a port 5 for alinement at predetermined times with the intake port 9 to provide communication between the bore 1 and the cylinder ID for the admission of operating fluid to the cylinder.

Formed in the body or casing 3, one to either side of the exhaust port 8 and in the same plane, transversely of the valve, as said exhaust port 8, are two exhaust ports H and 2 which are alined with each other and which lead from the bore 3 through opposite sides of the casing 3. For alinement with these ports 8, H and 2 at predetermined times during rotation of the plug 4, said plug is provided with a port 6 in the form of a peripheral recess which is of a length, circumferentially of the plug, such that, as the plug is rotated in a single direction, communication is established first between the port 8 and one of said ports I! or l2, then between the port 3 and both of said ports II and I2 and, finally, between the port 8 and the other of said ports H or IE, the direction of rotation of the plug being dependent only upon the relative angular disposition of the ports 5 and ii and as will be readily apparent.

As a consequence of the dual ports H and I2, one to either side of the port 8, and the port 6 serving to establish communication between said ports 8, l l and I 2 as set forth, an exceptionally free exhaust from the cylinder I is provided and back pressure effects on the working of the engine piston within the cylinder are in a large measure eliminated since, by the time the exhaust products tend to build up any appreciable back pressure in the port I l or 12 with which the port 8 first is placed in communication, the path of the exhaust is shifted to the other port II or l2 which is free of back pressure creating gases or fluid.

The body or casing 3 preferably is of hollow construction to provide spaces 13 to receive cooling water, and, as shown, ports l4 and I5 are provided in the casing 3 for the circulation of cooling water through said spaces I3. Moreover, the body or casing 3 preferably is provided with ducts l6 leading to the plug 4 so that a lubricant may be supplied to said plug.

As illustrated in the present instance, the plug 4 is journaled at its ends in ball bearings I1 and the casing 3 is provided with threaded openings 20 to receive bolts for fastening a carburetor or the like to said casing in fuel supplying relationship to the port 1 in the plug 4.

Without further description it is thought that the construction, operation and advantages of the invention will be readily understood. It is desired to point out, however, that the construction illustrated is readily capable of modification in various respects within the spirit and scope of the invention as defined in the appended claims.

I claim:-

1. A rotary valve comprising a casing having a bore and provided at longitudinally spaced points with intake and exhaust ports opening into said bore to provide communication between a cylinder and said bore, said casing further having a pair or exhaust ports leading from said bore one to either side of said first mentioned exhaust port, and a plug rotatable within said bore and provided with an axial intake passageway and with a port leading laterally from said passageway through the side of the plug for alinement at predetermined times with the intake port in the casing, said plug further being provided with a peripheral recess to aline at predetermined times with the exhaust ports, said recess being of a length such that during rotation of the plug it provides communication first between the first mentioned exhaust port and one of the pair of exhaust ports, then between the first mentioned exhaust port and both of the pair of exhaust ports, and then between the first mentioned exhaust port and the other of the pair of exhaust ports.

2. A rotary valve comprising a casing having a bore and provided with an exhaust port opening into said bore to provide communication between a cylinder and said bore, said casing further having a pair of exhaust ports leading from said bore one to either side of said first mentioned exhaust port, and a plug rotatable within said bore and provided with a peripheral recess to aline at predetermined times during rotation of the plug with said first mentioned exhaust port and during its alinement with said port to aline first with one and then with the other of said pair of exhaust ports.

GEORGE HENRY KEMP. 

